Another question you may want to ask is, is the fan that you want to install a kit onto worth installing? The reason this is also important is based on the age of the fan you currently have installed. If you have a relatively new fan that has just been installed in the last year or two, this likely won't be a problem. However, if you installed a fan 10 years back and now you want to find a light kit for it - don't bother. Having a fan that is that old means it will be next to impossible to find parts for it. If the fan should break down later after you install your kit, and you can't find the part you need - well, you basically wasted some money there.

You can also try Google searching the name of your ceiling appliance, eg. Fanimation Belleria fan. Look around through the different results that show up on the page. Try looking for a result which lists compatible parts to the specific fan you are interested in. You can also call the manufacturer. Additionally, try researching the kit you are looking at. Copy + paste the model of the kit into Google and again look for compatible devices.

You want a fan with high quality fan components. For example, the die cast motor housings are far better than stamped motor housings. This is because the die cast motor housings reduce the fan's noise and keep the fan stable. You will also want your fan to have bearings that are permanently lubricated and it should have an oil reservoir that is sealed.